No sound through mini DVI-HDMI adapter.

I've never had a problem hooking my Macbook Air up to my TV through the HDMI cable before. I believe the change happened after updating to 10.8.2, but I can't be sure. When I plug in the adapter, the picture goes through to the TV (just as before), and in the Sound settings panel it has the option for playing through the TV (just as before), but no sound. Using the same adapter on a Macbook Pro running 10.7 - no problems.
Thanks for any help or tips in advance.

You already tried most of the steps to get this working, but I do suspect the ATI/AMD driver has somehow been corrupted.
You already tried the AMD drivers from HP's site, so I would give the drivers directly from AMD. Worst case scenario is it doesn't resolve the issue. The linked driver is what was returned when selecting the options for the notebook on AMD's driver page. Notebook>Radeon HD>Mobility Radeon HD 4XXX Series>Windows 7 64bit.
Let me know what happens.
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I've just hooked my 20" iMac up to my Toshiba 37" HDTV using a mini dvi-HDMI adapter, and works well, EXCEPT for the green tinge (or hue) that is showing up on my TV. Any suggestions or ideas?

I've just hooked my 20" iMac display up to my Toshiba 37" HDTV using a mini dvi-HDMI adapter, and everything works well, EXCEPT for the green tinge (or hue) that is showing up. Everything else looks pretty good though..... The color that is on my iMac is still good, Its just green on the TV.
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Okay, now I'm confused. I always understood the digital audio limitation on the mini display output to be the result of stepping it down to DVI before bumping it back up to HDMI with an adaptor. Unless there's a mini display-to-HDMI option AND the mini display port is wired for audio, I don't expect anyone will be making a single-port, single-cable solution anytime soon.
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Hello clamb1993,
Thank you for using Apple Support Communities.
You can use the following article to troubleshoot your HDMI out connection:
Apple computers: Troubleshooting issues with video on internal or external displays
Regards,
Jeff D.

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No sound through mini DVI-HDMI adapter.

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